Mr Smith, of no fixed abode, claims the Crawts were responsible for the killing, while he stood by and watched in shock. On Tuesday (March 5), his barrister Graham Trembath QC, described his client as a "Walter Mitty character" whose admitted lies to the police had demonstrated "teenage bravado".

"You have seen Shane Crawt," he told the jury. "6ft 3, big build, powerful looking. You have Charlie Smith, a bit weedy, a bit skinny, all mouth and no trousers. In modern parlance you might call him a pussy."

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Scott Wilkinson murder trial

He contrasted this further with Shane Crawt, of Old Lodge Lane, Purley, saying Mr Crawt was capable of carrying out a "gratuitous incident of violence", shown by an alleged assault on a teenage boy shortly before the attack on Mr Wilkinson. Mr Smith on the other hand had been "repeatedly bullied" while on remand, he said.

Speaking on behalf of Lenny Crawt, who did not give evidence during the trial, Tyrone Smith QC stated that there was no evidence to suggest his client had taken part in the attack on Mr Wilkinson or even been present when it occurred.

"Which witness is it that says Lenny Crawt hit him with a pole or lump of wood around the head?" he said. "There isn't one."

Police divers search the Thames near Sunbury Lock in August 2016 after Scott Wilkinson's body was found nearby (Image: Grahame Larter/Surrey Advertiser)

Mr Smith also pointed to other witnesses who said they had heard confessions from Shane Crawt and Charlie Smith which had either not mentioned Lenny Crawt, or said he had nothing to do with the attack.

The judge, Jonathan Black, is due to finishing summing up the case on Wednesday morning (March 6), after which the jury will retire to consider its verdict.